How to make parts of texture shiny and reflective?
For demonstration purpose, the specular map is also being used as the diffuse channel to showcase the effect more.

Normally, the diffuse color map should only have the 'Diffuse Color' checked in the influence tab and the specular map shouldn't have this one checked at all.

Without the specular map influence:





With the specular map influencing the material's specular behavior:



Reflectivity: